Hi Everyone - Maybe you can help me with an issue I'm dealing with. We have a sodium heat transfer pipe that had formed a yellow crust around one end. One possibility is that the integrity of the pipe was somehow breached and some sodium had gotten out - that's how it was originally explained to me. As you know sodium is grayish - but this material is yellow. I first suspected either the per - or super oxide had somehow gotten formed - though I don't know the environmental conditions the heat transfer pipe was subjected to. But sodium, unlike potassium doesn't readily form oxides unless coaxed somewhat. Another possibility is that the hydroxide or carbonate was formed - but both of these are white in appearance. Any thoughts on what this yellowish material may be? Also any thoughts on how to safely collect a sample for testing? We could do a peroxide or a pH test but this would first involve physically removing a piece of the material and then subjecting it to aqueous testing methods. You can respond to me directly at ldmclouth**At_Symbol_Here**lbl.gov if you wish Thanks Larry
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